Grinding-mill.



T. C. CADWGAN.

GRINDING MILL.

APPLICATION FILED Nov. 5, 1914.

Patented June 29, 1915.

2 SHEETS-SHEET l.

attozmia THE NDRRIS PETERS CD., PHOIC-LITHO WASHINGTON. D. c.

T. C. CADWGAN.

GHINDING MYLL.

APPLICATION FILED NOV- 5. 1914.

1,144,689. Patented June 29, 1915.

2 SHEETS-SHEET 2.

Fig.2

c the casing; saidrods l err r g nr erica.

, enrNnINe-MILL.

Specification of Letters Patent.

Patented J une 29, 1915..

Appiicatibn'ied.November 5, 1914. serial no. 870,386.

T0 all whom it may concern: p

Be it known that I, THOMAS C. CADWGAN, a citizen of the United States, 'residing at Springfield, in the county lof Clark and State of Ohio, have invented certain-new and useful Improvements in Grinding Mills, of which the followingis a specification. f

` My invention relates to improvements in grinding mills and particularly to grinding mills of the duplex type. y l

An object ofthe invention isto provide a mill with a central feed that is, a mill so constructed that thel respective pairs of grinding plates will belocated on oppositey sides of the passage from the hopper.

A further object `of the invention is to provide simple and effective meansfor adjusting the grinding plates for coarse or fine grinding. y y

A further object of 'the invention is to provide a mill of the character referred to which will be simple in 'constructiom ec'o nomical in manufacture' and effective in use.

In the accompanying drawings: Figure 1 is a longitudinal section off'the rgrinding mills embodying myimprovement, the section'being taken on the line 1 1 of Fig. 3. Fig. 2 is a top plan viewof'the same with the hopper .and breakers removed."y Fig. 3k

is an'end view of the mill.' Figa isla detail of a portion of the plate adjusting mechamsm.

Like parts are indicated by similar char-y acters of reference in the several views.

In the said drawings 1 represents a stationary portion of the main casing and 2 a movableV portion of the same. The .stationary portion 1 is supported upon a suitable supporting frame'By and the movable portion is slidably mountedupon rods 11 and 5 which are connected with' and project longitudinally from the stationary` portion 1 of and 5 being secured in the bosses Gon the sides of the stationary part 1 and the movable part 2 having bosses 7' which are slidably mounted upon said rods. they meet are shouldered and overlap as shown in Figi/1.

The stationary portion lof ythe casing 'Ihe respective casinglparts where carries a stationary grinding bur 8 and the movable portion 2 of the casing also has a stationary grinding bur or plate 9; the respectivey grinding plates 8 and 9 having shouldered overlapping portions as shown in Fig. 1. Journaled in suitable bearings formed upon the respective casing portions is a driven shaft 10, which shaft has rotatably connected therewith grindingplates 11 and 12 which cooperate with the respective stationary plates 8 and 9;,said plates 11 and 12 being splined to the shaft so as to be capable of being removed therefrom when desired but held against longitudinal movement thereon by pins 11a and 12a. Also splined to said shaft 10 between the plates 11 and 12 are Crushers and conveyers 13 and 14, the spiral ribs 15 of which are arranged in opposite directions so that the conveyer 13 will convey the material to the grinding plates 9 and 12 and the conveyer 14 will conveyy the material to the grinding plates 8 and 11.

Suitable discharge openings (not shown) are provided at each end of the casing for the discharge of the ground material.

The shaft 10 is longitudinally movabley in its bearing within certain limits determined by the distance separating the stationary and revoluble grinding plates.

In order to provide for adjusting the grinding plates, for the purpose of regulating the fineness of the ground material, I have provided means for moving the movable casing portion 2, together with the grinding plate 8, longitudinally upon the guides 4E and 5 so as to permit of a movement of the shaft 10 and its revoluble plate.

Pivotally connected to the bearing 16 of the movable portion ofthe casing is a lever 1.7, said lever being provided with an elongated opening 18 to which said bearing 16 extends and being pivotally connected to said bearing by the pivot screw 19. One end of the ylever is bifurcatedat 2O and straddles the grooved hub portion 21 of the hand wheel 22, which hand wheel is mount# usual hopper v and a non-revoluble member, connecting said revoluble members, the nonlever is pivotally connected to said rod 5 by a cotter pin 24.

As a result of this construction, by turning the hand wheel 22 the movable portion 2 of the casing can be moved in or out with respect to the stationary portion 1 so as topincrease or diminish the space between the plates 8 and 9. For instance assumingthe grinding plates to be in their closest grinding relation, as shown in Fig. l, ifnow, it is desired to adjust the plates farther apart, the hand wheel will be manipulatedV so as to throw the movable part of the casing 2 in-L wardly thus causing the plates 8 and 9 to be brought closer together. The action of the ground material will then cause the two plates 11 and 12 to self-adjust themselves withrespect to Athe .plates 9 and 8 by the movement of the shaft 10 longitudinally in its bearings.

The grinding casing is surmounted by the 25 having the usual breakers 26"driv e n in any suitable wayV from the shaft 27, this construction being well known.

Having thus described my invention, I claim:

1. In a grinding mill, a main casing, two separate pairs of grinding members arranged in the same horizontal casing, each pair consisting of a revoluble a drive shaft i'evoluble members being located between the revoluble members, means for adjusting the non-revoluble member of one pair relatively to the opposing revoluble member, said shaft being capable of a limited longitudinal movement to permit said revoluble members to self-adjust themselves relatively to the non-revoluble members, and a hopper connected with the upper portion of said casingy and arranged to discharge the material therein between the noii-revolublemembers, together with a conveyer connected with said shaft for conveying said material in opposite directions to said grinding members.

'2. In a. grinding mill, a vcasing formed in two sections, two pairs of grinding members therein, each pair consisting of a revoluble and a non-revoluble member, Athe non-revoluble members being supported respectively by the casing sections and having a sliding engagement with each other, a driven shaft extending through said casing to which the revoluble grinding members are connected, and means for adjusting the casing sections relatively to each other to vary the distance between the non-revoluble grinding members,jsaid shaft being capable of a limited movement through said casing to permit the revoluble members to self-adjust themselves relatively to the'non-revoluble members.v

3. In a grinding mill, a casing formed in 1 grinding members,

plane in said two sections, two pairs of grinding members therein, each pair consisting of a revoluble and non-revoluble member, the non-revoluble members being supported by the respective casing parts, a driven shaft extending through said casing to which the revoluble grinding members are connected, and

m'eansf-for adjusting one casing section to vary the distance between the non-revoluble said shaft being capable of a limited movement in either direction through said lcasing to permit vthe revoluble members to self-adjust themselves relatively to the non-revoluble members at each adjustment of said casing section. Y

4l. In a grinding mill, a casing formed in two sections, one of ywhich is movable relativelygtothe other, two pairs of grinding members located in said casing in the same horizontalplane, each pair consisting of a revoluble and non-revoluble member, lsaid non-'revoluble -inembers being carried by. the respective casing sections and being located between the revol'uble members, a driven shaft extending through said casing to which the. rev'oluble 4membersare connected,and ineansffor adjusting the movable casiiig sectionto vary the distance between the non-revoluble members, said shaft being capable of a limited longitudinal movement yso as to permit the revoluble grinding membersl to vself-adjust themselves relatively to the non-revoluble members at each adjustment of said movable section.

5, In a grinding mill, a casing formed in two sections, one ksection vbeing slidably connectedv withr the other, grinding members located in said casing, vdriven shaft extending through said casing, part of said grind-l ported from said stationary section upon which. said movable section is -slidably mounted, grinding .members located in said casing, a driven Y shaft extending through said casing, being supported by said ycasing and part connected with said shaft, devices for adjusting said movable casing section for the plurpose of varying .the relation ,between said grinding members, said. adjustingdevices consisting of a lever ypivotally conpart ofsaid grinding members'y neoted to the one of said supporting rods and also pivotally connected to said movable section, and a hand Wheel adjustably mounted on a sCreW threaded part of the other supporting rod, having a grooved hub, the free end of said lever having a bifurcated portion fitted over said hub.

Copies oi this patent may be obtained for ve cents each, by addressing the In testimony whereof, I have hereunto set my hand this 17th day of October 1914.

THOMAS C. CADWGAN.

Witnesses:

CHAs. I. WELCH, EFFA MARY SMITH.

Commissioner of Patents,

Washington, D. C. 

